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history
From Zhu Xi's Song-dynasty poem 《观书有感》: "问渠哪得清如许？为有源头活水来" — ask how the pond stays so clear; it is because fresh water keeps flowing in from the source. A famous Neo-Confucian metaphor for the need to keep learning.
culture
The line from Zhu Xi's poem is one of the most quoted couplets in Chinese education. Using this chengyu in writing subtly invokes Zhu Xi and the ideal of continuous study.
